juliana's crossword puzzle

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Across
  1. 3. has constants,variables and exponents
  2. 6. inverse what is added to a number to get zero
  3. 9. has two terms
  4. 12. answer to addition
  5. 13. a number times another number
  6. 15. has one term
Down
  1. 1. numbers that are part of a term with variables
  2. 2. letters that represent something
  3. 4. a number minus another number
  4. 5. average
  5. 7. subtraction
  6. 8. has three terms
  7. 10. contain only numbers
  8. 11. says how many times to use the value in multiplication
  9. 14. most often